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Third Ventricle
Definition 1
A centrally placed component of the ventricular system of the brain located in the diencephalon. Cerebrospinal fluid from the lateral ventricles flows into the third ventricle via the foramina of Monroe and exits the third ventricle via the aqueduct of Sylvius. The thalamus and hypothalamus border the lateral walls of the third ventricle. (NCI Thesaurus)
Definition 2
A narrow cleft inferior to the corpus callosum, within the diencephalon, between the paired thalami. Its floor is formed by the HYPOTHALAMUS, its anterior wall by the lamina terminalis, and its roof by EPENDYMA. It communicates with the FOURTH VENTRICLE by the CEREBRAL AQUEDUCT, and with the LATERAL VENTRICLES by the interventricular foramina. (NLM, Medical Subject Headings)
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